RNS-e and SD cards

Hi, new to the forum, but have already found it very informative. I would appreciate some advice about SD cards.
I have just bought a 4G card and filled it up with MP3 files (recorded at a bit rate of 192)
The artist folders appear alphabetically on the RNS-e, but it doesn't seem able to read information on the card beyond M, which I have worked corresponds to just over 2Gig of data.
Is there any way round this or is it the case that the RNS-e can only handle a maximum of 2G per card?
Thanks in advance

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